I am using my machine with multiple accounts logged in at the same time. I am using KDM desktop manager and KDE desktop. Ever since I upgraded to Karmic, when using one user the second user, who is active on another virtual terminal, gets logged out automatically. I have looked through the logs and can't find anything that would cause this.

What should I be looking into to figure it out? Is there some sort of feature that was turned on through the upgrades? (the machine has been through many releases..).